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    Aging Approach to Water Effect on Alkali–Silica Reaction Degradation of Structures

    Source: Journal of Engineering Mechanics:;2003:;Volume ( 129 ):;issue: 001
    Author:
    Alexander Steffens
    ,
    Kefei Li
    ,
    Olivier Coussy
    DOI: 10.1061/(ASCE)0733-9399(2003)129:1(50)
    Publisher: American Society of Civil Engineers
    Abstract: The maintenance of a considerable number of concrete structures the durability and serviceability of which are endangered by the alkali–silica reaction (ASR) requires a quantitative structural evaluation and prediction, in time and space, of the structural effects of ASR expansion. Considerable research effort has been dedicated to the mechanical modeling of ASR-induced concrete swelling. However, its predominant factor, the internal humidity, has not yet been clearly understood. Recent laboratory tests on the influence of humidity on ASR expansion allow us to better understand the swelling mechanisms. The aim of this paper is to discuss the role of water at both reaction and material level, to propose a comprehensive mechanical model for the material swelling with a hydrochemomechanical approach, and finally, to study structural effects of ASR by means of the new model. The proposed model adopts a two-stage mechanism for the swelling kinetics, consisting of the formation of an amorphous gel for which a characteristic time of reaction is identified and of the combination of important quantities of water by the gel. Because the combination of water shows an aging effect a second reaction with a characteristic time of aging is introduced. Furthermore, the initial phase of the material swelling is explained by the filling process of internal pores by the swollen gel. The model is verified by using experimental data. At a structural level, a characteristic ASR water diffusion length is proposed to evaluate the concrete surface delamination depth. Its range is calculated by means of an one-dimensional analysis of ASR swelling activated by water diffusion. As a case study a reactive retaining wall is analyzed with the new model integrated into a finite element scheme. The material degradation process and the structural responses are illustrated and discussed.
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      Aging Approach to Water Effect on Alkali–Silica Reaction Degradation of Structures

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    contributor authorAlexander Steffens
    contributor authorKefei Li
    contributor authorOlivier Coussy
    date accessioned2017-05-08T22:39:56Z
    date available2017-05-08T22:39:56Z
    date copyrightJanuary 2003
    date issued2003
    identifier other%28asce%290733-9399%282003%29129%3A1%2850%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/85632
    description abstractThe maintenance of a considerable number of concrete structures the durability and serviceability of which are endangered by the alkali–silica reaction (ASR) requires a quantitative structural evaluation and prediction, in time and space, of the structural effects of ASR expansion. Considerable research effort has been dedicated to the mechanical modeling of ASR-induced concrete swelling. However, its predominant factor, the internal humidity, has not yet been clearly understood. Recent laboratory tests on the influence of humidity on ASR expansion allow us to better understand the swelling mechanisms. The aim of this paper is to discuss the role of water at both reaction and material level, to propose a comprehensive mechanical model for the material swelling with a hydrochemomechanical approach, and finally, to study structural effects of ASR by means of the new model. The proposed model adopts a two-stage mechanism for the swelling kinetics, consisting of the formation of an amorphous gel for which a characteristic time of reaction is identified and of the combination of important quantities of water by the gel. Because the combination of water shows an aging effect a second reaction with a characteristic time of aging is introduced. Furthermore, the initial phase of the material swelling is explained by the filling process of internal pores by the swollen gel. The model is verified by using experimental data. At a structural level, a characteristic ASR water diffusion length is proposed to evaluate the concrete surface delamination depth. Its range is calculated by means of an one-dimensional analysis of ASR swelling activated by water diffusion. As a case study a reactive retaining wall is analyzed with the new model integrated into a finite element scheme. The material degradation process and the structural responses are illustrated and discussed.
    publisherAmerican Society of Civil Engineers
    titleAging Approach to Water Effect on Alkali–Silica Reaction Degradation of Structures
    typeJournal Paper
    journal volume129
    journal issue1
    journal titleJournal of Engineering Mechanics
    identifier doi10.1061/(ASCE)0733-9399(2003)129:1(50)
    treeJournal of Engineering Mechanics:;2003:;Volume ( 129 ):;issue: 001
    contenttypeFulltext
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